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Year : 2014  |  Volume : 62  |  Issue : 9  |  Page : 907-910

Correlation between the pressure-to-cornea index and both structural and functional measures of glaucoma

Department of Ophthalmology, Brotherhood of Santa Casa de Misericordia de Sao Paulo, Santa Casa de São Paulo School of Medical Sciences, Sao Paulo, Brazil

Correspondence Address:
Niro Kasahara
Rua Sao Mauro 292, Sao Paulo, SP-02526-050
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0301-4738.143924

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Purpose: the pressure-to-cornea index (PCI) was proposed in order to integrate intraocular pressure and central cornea thickness as a single-risk factor for glaucoma. The purpose of this study was to correlate the PCI with a structural and two functional measures of glaucoma. Setting: University Hospital in South America. Materials and Methods: Pressure-to-cornea index was calculated for 70 eyes of 36 subjects (glaucoma and suspects). Cup-to-disc (C/D) ratio, mean deviation (MD) and pattern standard deviation (PSD) as recorded by Humphrey automated perimetry (SITA 24-2) were correlated with PCI (Pearson's correlation coefficient). Results: Pearson's correlation coefficient between PCI and C/D was 0.329 (95% confidence interval [95% CI], 0.09-0.526; P = 0.006); between PCI and MD was − 0.356 MD (95% CI, −0.549 to − 0.126; P = 0.003); and between PCI and PSD was − 0.215 (95% CI, −0.433 to 0.025; P = 0.07). Conclusion: In addition to serve as a single-risk factor, PCI can be used to stage glaucoma severity as well.

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